a: \(f\left(5\right)=-2\cdot5^2=-2\cdot25=-50\)
\(f\left(-5\right)=-2\cdot\left(-5\right)^2=-2\cdot25=-50\)
b: y=-2
=>\(-2x^2=-2\)
=>\(x^2=1\)
=>\(\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
a: f(5)=−2⋅52=−2⋅25=−50
f(−5)=−2⋅(−5)2=−2⋅25=−50
b: y=-2
=>−2x2=−2
=>x2=1
=>[x=1x=−1